CN113394980A - Power supply conversion circuit - Google Patents

Power supply conversion circuit Download PDF

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Publication number
CN113394980A
CN113394980A CN202010172719.9A CN202010172719A CN113394980A CN 113394980 A CN113394980 A CN 113394980A CN 202010172719 A CN202010172719 A CN 202010172719A CN 113394980 A CN113394980 A CN 113394980A
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CN
China
Prior art keywords
circuit
conversion circuit
voltage
capacitor
inductor
Prior art date
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Pending
Application number
CN202010172719.9A
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Chinese (zh)
Inventor
江森龙
邱治维
田晨
张俊
张加亮
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Guangdong Oppo Mobile Telecommunications Corp Ltd
Original Assignee
Guangdong Oppo Mobile Telecommunications Corp Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Guangdong Oppo Mobile Telecommunications Corp Ltd filed Critical Guangdong Oppo Mobile Telecommunications Corp Ltd
Priority to CN202010172719.9A priority Critical patent/CN113394980A/en
Priority to PCT/CN2021/078474 priority patent/WO2021179930A1/en
Priority to EP21768049.5A priority patent/EP4120534A4/en
Publication of CN113394980A publication Critical patent/CN113394980A/en
Priority to US17/942,884 priority patent/US20230006562A1/en
Pending legal-status Critical Current

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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M3/00—Conversion of dc power input into dc power output
    • H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
    • H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
    • H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
    • H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
    • H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
    • H02M3/33507—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of the output voltage or current, e.g. flyback converters
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M3/00—Conversion of dc power input into dc power output
    • H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
    • H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
    • H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
    • H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
    • H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
    • H02M3/33569—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements
    • H02M3/33573—Full-bridge at primary side of an isolation transformer
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M3/00—Conversion of dc power input into dc power output
    • H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
    • H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
    • H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M3/145—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
    • H02M3/155—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
    • H02M3/156—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/0067—Converter structures employing plural converter units, other than for parallel operation of the units on a single load
    • H02M1/007—Plural converter units in cascade
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M3/00—Conversion of dc power input into dc power output
    • H02M3/005—Conversion of dc power input into dc power output using Cuk converters
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M3/00—Conversion of dc power input into dc power output
    • H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
    • H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
    • H02M3/06—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using resistors or capacitors, e.g. potential divider
    • H02M3/07—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using resistors or capacitors, e.g. potential divider using capacitors charged and discharged alternately by semiconductor devices with control electrode, e.g. charge pumps
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M3/00—Conversion of dc power input into dc power output
    • H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
    • H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
    • H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M3/145—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
    • H02M3/155—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
    • H02M3/156—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators
    • H02M3/158—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators including plural semiconductor devices as final control devices for a single load
    • H02M3/1582—Buck-boost converters
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
    • H02M7/02—Conversion of ac power input into dc power output without possibility of reversal
    • H02M7/04—Conversion of ac power input into dc power output without possibility of reversal by static converters
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
    • H02M7/02—Conversion of ac power input into dc power output without possibility of reversal
    • H02M7/04—Conversion of ac power input into dc power output without possibility of reversal by static converters
    • H02M7/06—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes without control electrode or semiconductor devices without control electrode
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
    • H02M7/02—Conversion of ac power input into dc power output without possibility of reversal
    • H02M7/04—Conversion of ac power input into dc power output without possibility of reversal by static converters
    • H02M7/12—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M7/21—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
    • H02M7/217—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
    • H02M7/219—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only in a bridge configuration

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Dc-Dc Converters (AREA)

Abstract

The embodiment of the application discloses a power conversion circuit, which can improve the efficiency of power conversion. The power supply conversion circuit comprises a primary transformation coil, a secondary transformation coil and a first direct current conversion circuit; the primary transformation coil is coupled with the secondary transformation coil, and the secondary transformation coil is connected with the first direct current conversion circuit; the first direct current conversion circuit is connected with an electric load; a primary transformer coil for generating an electromagnetic field according to an initial voltage input to the primary transformer coil, and coupling the electromagnetic field to a secondary transformer coil; the secondary transformation coil is used for generating induction current through an electromagnetic field, generating secondary output voltage according to the induction current and transmitting the secondary output voltage to the first direct current conversion circuit; and the first direct current conversion circuit is used for adjusting the secondary output voltage based on the preset required voltage of the power load to obtain the target voltage.

Description

Power supply conversion circuit
Technical Field
The application relates to the technical field of power supplies, in particular to a power supply conversion circuit.
Background
For the power conversion circuit to adjust the output voltage according to the requirement of the electrical load, a common method is to add a separate coil feedback winding on the primary coil side of the transformer in the power conversion circuit, and transmit the voltage required by the electrical load to the primary coil side of the transformer through the coil feedback winding; or the voltage is divided by a resistor on the secondary coil side of the transformer, a voltage feedback signal of the electric load is transmitted back through the comparator and the optical coupler, and finally the output voltage on the secondary coil side is adjusted by the control circuit on the primary coil side of the transformer according to the feedback signal. The two feedback modes have longer feedback loops and poorer real-time adjustment, thereby reducing the efficiency of voltage conversion.
Disclosure of Invention
Embodiments of the present application are expected to provide a power conversion circuit, which can improve efficiency of power conversion.
The technical scheme of the application is realized as follows: the application provides a power conversion circuit, which comprises a primary transformation coil, a secondary transformation coil and a first direct current conversion circuit;
the primary transformer coil is coupled with the secondary transformer coil, and the secondary transformer coil is connected with the first direct current conversion circuit; the first direct current conversion circuit is connected with an electric load;
the primary transformer coil is used for generating an electromagnetic field according to an initial voltage input to the primary transformer coil and coupling the electromagnetic field to the secondary transformer coil;
the secondary transformation coil is used for generating induction current through the electromagnetic field, generating secondary output voltage according to the induction current and transmitting the secondary output voltage to the first direct current conversion circuit;
the first direct current conversion circuit is used for adjusting the secondary output voltage based on the preset required voltage of the electric load to obtain the target voltage.
The embodiment of the application provides a power conversion circuit, which comprises a primary transformation coil, a secondary transformation coil and a first direct current conversion circuit; the primary transformation coil is coupled with the secondary transformation coil, and the secondary transformation coil is connected with the first direct current conversion circuit; the first direct current conversion circuit is connected with an electric load; a primary transformer coil for generating an electromagnetic field according to an initial voltage input to the primary transformer coil, and coupling the electromagnetic field to a secondary transformer coil; the secondary transformation coil is used for generating induction current through an electromagnetic field, generating secondary output voltage according to the induction current and transmitting the secondary output voltage to the first direct current conversion circuit; and the first direct current conversion circuit is used for adjusting the secondary output voltage based on the preset required voltage of the power load to obtain the target voltage. By adopting the scheme, the secondary side of the transformer can directly interact with the power load through the first direct current conversion circuit, the secondary output voltage of the secondary transformer coil is regulated to be the target voltage according to the preset demand voltage required by the power load, the preset demand voltage does not need to be fed back to the primary side of the transformer through the feedback circuit to be regulated by the primary side, and therefore the power conversion efficiency is improved.
Drawings
Fig. 1 is a conventional power conversion circuit structure;
fig. 2 is a conventional structure of a dedicated coil feedback type power conversion circuit;
fig. 3 is a conventional optocoupler power conversion circuit structure;
fig. 4 is a first structural diagram of a power conversion circuit according to an embodiment of the present disclosure;
fig. 5 is a second structural diagram of a power conversion circuit according to an embodiment of the present disclosure;
fig. 6 is a structural diagram of a switching dc boost circuit according to an embodiment of the present application;
fig. 7 is a third structural diagram of a power conversion circuit according to an embodiment of the present application;
fig. 8 is a structural diagram of a switching dc step-down circuit according to an embodiment of the present application;
fig. 9 is a fourth structural diagram of a power conversion circuit according to an embodiment of the present application;
fig. 10 is a structural diagram of a switching dc buck-boost circuit according to an embodiment of the present disclosure;
fig. 11 is a fifth structural diagram of a power conversion circuit according to an embodiment of the present application;
fig. 12 is a sixth structural diagram of a power conversion circuit according to an embodiment of the present application;
FIG. 13 is a first waveform of an electrical signal provided by an embodiment of the present application;
FIG. 14 is a waveform diagram of an electrical signal provided by an embodiment of the present application;
fig. 15 is a seventh structural diagram of a power conversion circuit according to an embodiment of the present application;
fig. 16 is a eighth structural diagram of a power conversion circuit according to an embodiment of the present application;
fig. 17 is a waveform diagram of an electrical signal provided in the embodiment of the present application.
Detailed Description
At present, when an electrical appliance uses a power supply to supply power, the power supply is generally required to provide different voltages, for example, when a mobile phone supporting a USB-PD (USB-power delivery) protocol is charged, an initial ac voltage supplied by the power supply needs to be converted into a dc power with continuously adjustable voltage. The conventional common voltage regulation method can be as shown in fig. 1, where fig. 1 is a conventional power conversion circuit structure, wherein, the power source 10 provides alternating current, the alternating current is converted into pulse square wave through the rectifying and filtering circuit 20 and the pulse width modulation circuit 80, and is applied to the coil of the primary side 30_1 of the transformer 30, the coil of the primary side 30_1 of the transformer generates induction electromagnetic field according to the pulse square wave, the induction electromagnetic field is coupled to the coil of the secondary side 30_2 of the transformer, the coil of the secondary side 30_2 of the transformer generates induction current according to the induction electromagnetic field, the output voltage of the transformer secondary side 30_2 is determined according to the turn ratio of the transformer primary side 30_1 to the transformer secondary side 30_2 coil, and the induced current of the transformer secondary side 30_2 is converted into direct current through the secondary rectifying and filtering circuit 40 and is provided to the electric load 50. In the power conversion circuit structure shown in fig. 1, the power load 50 can feed the required voltage back to the transformer primary side 30_1 in the form of a power feedback signal through a dedicated sampling feedback circuit 60 and an isolation device 70 (typically, a signal isolation conversion chip for isolating the respective currents of the transformer primary side coil and the transformer secondary side coil), and then continuously adjust the voltage applied to the transformer primary side 30_1 according to the power feedback signal through the pulse width modulation circuit 80, so as to change the voltage output from the transformer secondary side 30_2 through the fixed turns ratio of the coil windings in the transformer 30.
In practical applications, based on the power conversion circuit structure shown in fig. 1, as shown in the dashed line box in fig. 2, the sampling feedback circuit 60 is generally composed of a single dedicated feedback coil winding for taking a power feedback signal from the transformer secondary side coil, a reverse bias blocking diode D2, and resistors R5 and R6, wherein the dedicated feedback coil winding is used for adjusting the output voltage of the transformer secondary side coil, and R5 and R6 are used for adjusting the output voltage of the transformer secondary side coil. As can be seen from fig. 2, U2 obtains the information of the output voltage V + through the feedback coil winding, and when the output voltage V + needs to be adjusted according to the required voltage of the electrical load, the adjustment loop is: the power supply feedback signal is fed back to the pulse width modulation circuit by the electric load through the isolation device, then the pulse width modulation circuit obtains the sampling voltage from the transformer feedback winding, and adjusts the pulse width or frequency of the pulse square wave, and finally the output voltage is obtained, so the feedback loop is longer, and the real-time performance of the adjustment is poorer. Furthermore, because the transformer has the defects of leakage inductance, leakage flux and the like, the primary transformer coil, the secondary transformer coil and the feedback winding cannot ideally realize the proportion relationship determined by the turn ratio, and therefore the method for controlling the secondary output voltage by returning the sampling voltage signal through the special feedback winding is poor in accuracy.
In the embodiment of the present application, based on the power conversion circuit structure shown in fig. 1, in practical application, based on the power conversion circuit structure shown in fig. 1, the sampling feedback circuit 60 may also be as shown in a dashed line frame in fig. 3, voltage division is performed on the output voltage on the secondary side of the transformer through resistors R7 and R8, the divided sampling voltage is delivered to a comparator, the comparator transmits the comparison result between the sampling voltage and the reference voltage Vref to the optical coupling chip T1, the optical coupling chip T1 transmits the isolated feedback signal to the SW interface of the control chip on the primary side, and the control chip adjusts the PWM pulse width or frequency on the coil on the primary side of the transformer according to the signal transmitted back by the optical coupling chip. The voltage regulating circuit shown in fig. 3 needs to use an optocoupler chip as a signal isolation device between the primary side and the secondary side of the transformer, the path for feeding back the sampling voltage signal to the pulse width control circuit is long, and the speed of the optocoupler chip cannot meet the higher response requirement.
In addition, in the above prior art, the circuit for controlling the voltage is mainly located on the primary side of the transformer, which results in high voltage on the primary side, the required high voltage resistant devices are usually packaged in a large size, and the capacitance value of the capacitor is low, which also affects the overall size of the circuit.
As shown in fig. 4, fig. 4 is a structural diagram of a power conversion circuit provided in an embodiment of the present application, where the power conversion circuit includes a primary transformer coil 400_1, a secondary transformer coil 400_2, and a first dc conversion circuit 400_ 3; the primary transformer coil 400_1 is coupled with the secondary transformer coil 400_2, and the secondary transformer coil 400_2 is connected with the first direct current conversion circuit 400_ 3; the first direct current conversion circuit 400_3 is connected with an electric load; the primary transformer coil 400_1 is configured to generate an electromagnetic field according to an input initial voltage, and couple the electromagnetic field to the secondary transformer coil; the secondary transformer coil 400_2 is configured to generate an induced current through an electromagnetic field, generate a secondary output voltage according to the induced current, and transmit the secondary output voltage to the first dc conversion circuit; the first direct current conversion circuit 400_3 is configured to adjust the secondary output voltage based on a preset required voltage of the electrical load, so as to obtain a target voltage.
In the embodiment of the application, the initial voltage is provided by a power supply, wherein the initial voltage and the initial current provided by the output end of the power supply are applied to a primary transformation coil of a transformer, so that the primary transformation coil of the transformer generates an electromagnetic field, electric energy is coupled from the primary transformation coil to a secondary transformation coil through the electromagnetic field, and the secondary transformation coil generates induced current through the induced electromagnetic field, so that secondary output voltage is generated and transmitted to a first direct current conversion circuit connected; the first direct current conversion circuit can intermittently apply the secondary output voltage to the electric load by controlling the on-off of the electric power electric device in the first direct current conversion circuit according to the preset voltage required by the electric load, so that the secondary output voltage is adjusted to the target voltage and is supplied to the electric load.
In the embodiment of the application, the power supply can be a direct current pulse power supply generator, and a direct current pulse voltage signal obtained by rectifying, filtering and modulating an alternating current power supply can also be used as the power supply.
In the embodiment of the application, the preset voltage is the voltage required by the electric load; the target voltage is obtained by adjusting the secondary output voltage by the power supply conversion circuit.
In this embodiment, the first dc conversion circuit may provide a target voltage higher than the secondary output voltage, or provide a target voltage lower than the secondary output voltage, or provide a target voltage higher than or lower than the secondary output voltage along with a real-time change of a preset voltage required by the electrical load.
In some embodiments, a communication chip may be further included between the first dc conversion circuit and the electrical load, and the communication chip is configured to feed back a preset voltage required by the electrical load to the first dc conversion circuit in real time, so that the first dc conversion circuit can adjust the preset voltage required by the electrical load to obtain a target voltage.
It can be understood that, in this embodiment of the application, the secondary side of the transformer may directly interact with the power load through the first dc conversion circuit, and the secondary output voltage of the secondary transformer coil is adjusted to the target voltage according to the preset required voltage required by the power load, without feeding back the preset required voltage to the primary side of the transformer through the feedback circuit, and the primary side of the transformer is adjusted, thereby improving the efficiency of power conversion.
In some embodiments of the present application, based on fig. 4, as shown in fig. 5, the first dc converter circuit 400_3 may be a switching dc boost circuit 400_40, where the switching dc boost circuit 400_40 is configured to increase the secondary output voltage by performing on-off control on the switching dc boost circuit 400_40 based on a preset voltage requirement of the electrical load, so as to obtain the target voltage.
In this application embodiment, when the preset voltage of power load demand is higher than the secondary output voltage of transformer output, can use switch direct current boost circuit as first direct current converting circuit, raise secondary output voltage to the target voltage.
In an embodiment of the present application, the switching dc boost circuit includes at least one of: the circuit comprises a BOOST circuit, a BUCK/BOOST circuit, a charge pump circuit and a CUK.
In some embodiments of the present application, based on fig. 5, the switching dc boost circuit 400_40 is shown in fig. 6, and includes a first inductor L1, a first switch Q1, a first diode D1, and a first capacitor C1. In fig. 6, Vi is a secondary output voltage outputted between the first terminal and the second terminal of the secondary transformer coil. A first terminal of the secondary transformer coil is connected with a first end of a first inductor L1, a second end of the first inductor L1 is connected with a first end of a first switch Q1, and a second end of the first switch Q1 is connected with a second terminal of the secondary transformer coil and is grounded at the same time, so that a first charging loop is formed; the second terminal of the first inductor L1 is connected to the anode of a first diode D1, the cathode D1 of the first diode is connected to the anode of a first capacitor C1, and the cathode of the first capacitor C1 is connected to the second terminal of the first switch Q1 and is also grounded, thereby forming a first discharge loop.
In the embodiment of the present application, the first switch Q1 is configured to turn on the first charging circuit according to a preset first control signal, or turn on the first discharging circuit according to a preset second control signal. When the pulse signal control circuit connected to the first switch Q1 outputs the preset first control signal, for example, when a high level signal is outputted, the first switch Q1 is turned on, and a current loop from the first terminal of the secondary transformer coil, through the first inductor L1, the first switch Q1 to the second terminal of the secondary transformer coil is turned on, so as to form a first charging loop for charging the first inductor L1. When the pulse signal control circuit connected to the first switch Q1 outputs the preset second control signal, for example, when a low level signal is output, the first switch Q1 is turned off, the first inductor L1 starts to charge the first capacitor C1 through the first diode D1, a first discharging loop is formed, the voltage across the first capacitor increases, and at this time, Vo is higher than Vi, and the boosting process is completed. Therefore, the voltage of Vo can be higher than the secondary output voltage Vi by the repeated on-off process of the first switch Q1.
When the first switch Q1 is in the on state, the output voltage Vo of the switching dc boost circuit is provided by the first capacitor C1 to supply power to the electric load.
In the embodiment of the present application, the first inductor L1 is configured to store energy through an output current of the secondary transformer when the first charging circuit is turned on, or discharge the first capacitor C1 when the first discharging circuit is turned on.
In the embodiment of the present application, the first diode D1 is used to isolate the first capacitor C1 from discharging to ground when the first charging loop is turned on.
In the embodiment of the application, the first capacitor C1 is connected in parallel with the electric load, and is configured to store power through the secondary transformer coil and the first inductor L1 when the first discharging loop is turned on, so that the output voltage Vo across the first capacitor C1 is higher than the secondary output voltage Vi across the secondary transformer coil, and the output voltage Vo across the first capacitor C1 is provided to the electric load as a target voltage.
It can be understood that, when the first dc conversion circuit is a switching dc boost circuit, the output voltage of the switching dc boost circuit can be higher than the secondary output voltage of the secondary transformer coil by switching on and off the first switch, and the rising amplitude of the output voltage of the switching dc boost circuit is controlled by controlling the duty ratio of the switching on and off of the first switch to meet the power consumption requirement of the continuous change of the power consumption load.
In some embodiments of the present application, based on fig. 4, as shown in fig. 7, the first dc converting circuit 400_3 may be a switching dc voltage reducing circuit 400_ 41. The switching direct-current voltage reduction circuit 400_41 is used for reducing the secondary output voltage by performing on-off control on the switching direct-current voltage reduction circuit 400_41 based on the preset voltage requirement of the electric load, so as to obtain the target voltage.
In the embodiment of the application, when the preset voltage required by the electric load is lower than the secondary output voltage output by the transformer, the switch direct-current voltage reduction circuit can be used as the first direct-current conversion circuit to reduce the secondary output voltage to the target voltage.
In an embodiment of the present application, the switching dc voltage reduction circuit includes at least one of: the circuit comprises a BUCK circuit, a BUCK/BOOST circuit, a charge pump circuit and a CUK circuit.
In some embodiments of the present application, based on fig. 7, the switching dc voltage reduction circuit 400_41 may include, as shown in fig. 8, a second switch Q2, a second diode D2, a second inductor L2, and a second capacitor C2, where Vi in fig. 8 is a secondary output voltage output between a first terminal and a second terminal of the secondary transformer, a first terminal of the secondary transformer is connected to a first terminal of the second switch Q2, a second terminal of the second switch Q2 is connected to a first terminal of the second inductor L2, a second terminal of the second inductor L2 is connected to an anode of the second capacitor C2, and a cathode of the second capacitor C2 is connected to a second terminal of the secondary transformer and is also grounded, so as to form a second charging loop; a first end of the second inductor L2 is connected to a cathode of the second diode Q2, an anode of the second diode Q2, a second terminal of the secondary transformer coil and a cathode of the second capacitor C2 are connected to ground and form a second discharge loop.
In the embodiment of the present application, as shown in fig. 10, the second switch Q2 is configured to turn on the second charging circuit according to a preset first control signal, or turn on the second discharging circuit according to a preset second control signal. When the pulse signal control circuit connected to the second switch Q2 outputs the preset first control signal, for example, when a high level signal is output, the second switch Q2 is turned on, and the output current of the secondary transformer coil is from the first terminal of the secondary transformer coil to the second terminal of the secondary transformer coil through the second switch Q2, the second inductor L2, and the second capacitor C2, so as to charge the second inductor L2, and at the same time, charge the capacitor C2, thereby forming a second charging loop, where the first terminal of the second inductor L2 is a positive electrode, and the second terminal of the second inductor L2 is a negative electrode. When the pulse signal control circuit connected to the second switch Q2 outputs the preset second control signal, for example, when a low level signal is output, the second switch Q2 is turned off, the second inductor L2 discharges through the second diode D2, at this time, the second terminal of the second inductor L2 is a positive electrode, the first terminal of the second inductor L2 is a negative electrode, the current of the second inductor L2 linearly decreases during the discharging process, the output voltage Vo is discharged by the second capacitor C2 and the reduced discharge current of the second inductor L2 is maintained, so that Vo decreases and is lower than the output voltage Vi of the secondary transformer coil, and the voltage reduction process is completed. Therefore, by the repeated on-off process of the second switch Q2, Vo can be lower than the secondary output voltage Vi.
In the embodiment of the present application, the second inductor L2 is configured to store energy through an output current of the secondary transformer when the second charging circuit is turned on, or discharge the second capacitor when the second discharging circuit is turned on.
In the embodiment of the present application, the second diode D3 is used for isolating the secondary transformer coil from discharging to the ground when the second charging loop is conducted.
In the embodiment of the present application, the second capacitor C2 is connected in parallel with the electric load, and is configured to discharge with the second inductor L2 when the second discharge loop is turned on, so that the output voltage Vo across the second capacitor C2 is lower than the secondary output voltage Vi of the secondary transformer coil, and the output voltage Vo across the second capacitor is provided to the electric load as the target voltage.
It can be understood that, when the first dc converting circuit is a switching dc voltage reducing circuit, the output voltage of the switching dc voltage reducing circuit can be lower than the secondary output voltage of the secondary transformer coil by switching on and off the second switch, and the reduction amplitude of the output voltage of the switching dc voltage increasing circuit is controlled by controlling the duty ratio of the switching on and off of the second switch to meet the power consumption requirement of the continuous change of the power consumption load.
In some embodiments of the present application, based on fig. 4, as shown in fig. 9, the first dc conversion circuit 400_3 may also be a switching dc buck-boost circuit 400_ 42. The switching dc boost-buck circuit 400_42 is configured to increase or decrease the secondary output voltage by performing on-off control on the switching dc boost-buck circuit 400_42 based on a preset voltage requirement of the electrical load, so as to obtain a target voltage.
In the embodiment of the application, the preset voltage required by the electric load during operation may be changed to be higher or lower, sometimes the electric load needs the preset voltage higher than the secondary output voltage output by the transformer, sometimes the electric load needs the preset voltage lower than the secondary output voltage output by the transformer, in this case, the switching dc boost-buck circuit may be used as the first dc conversion circuit, and the secondary output voltage is boosted or reduced to the target voltage according to the requirement of the electric load.
In some embodiments, the switched DC voltage reduction circuit may be a BUCK/BOOST circuit.
In the embodiment of the present application, based on fig. 9, the switching dc buck-boost circuit 400_42 may include a third switch Q3, a third inductor L3, a third diode D3, and a third capacitor C3 as shown in fig. 10, wherein Vi in fig. 10 is the secondary output voltage outputted between the first terminal and the second terminal of the secondary transformer coil, the first terminal of the secondary transformer coil is connected to the first terminal of the third switch Q3, the second terminal of the third switch Q3 is connected to the first terminal of the third inductor L3, the second terminal of the third inductor L3 is connected to the second terminal of the secondary transformer coil, thereby forming a third charging loop, the first end of the third inductor L3 is connected to the cathode of the third diode D3, the second end of the third inductor L3 is connected to the anode of the third capacitor C3, and the cathode of the third capacitor C3 is connected to the anode of the third diode D3, thereby forming a third discharging loop; the third inductor L3 and the third capacitor C3 are connected in parallel with the electricity load.
In the embodiment of the present application, as shown in fig. 10, the third switch Q3 is configured to turn on the third charging circuit according to a preset first control signal, or turn on the third discharging circuit according to a preset second control signal. When the pulse signal control circuit connected to the third switch Q3 outputs the preset first control signal, for example, when a high level signal is output, the third switch Q3 is turned on, the third diode D3 is reversely biased and turned off, the secondary transformer coil charges the third inductor L3, the first terminal of the third inductor L3 is positive, the second terminal of the third inductor L3 is negative, so as to form a third charging loop, the output voltage Vo is provided to the load by the third capacitor C3, and the longer the duration of the preset first control signal is, the larger the induced electromotive force accumulated on the third inductor L3 is. When the pulse signal control circuit connected with the third switch Q3 outputs a preset second control signal, for example, when a low level signal is output, the third switch Q3 is turned off, if the induced electromotive force on the third inductor L3 exceeds the voltage on the third capacitor C3 at this time, the third diode D3 is turned on, the second terminal of the third inductor L3 is a positive electrode, the first terminal of the third inductor L3 is a negative electrode, and the third inductor L3 supplies power to the electric load through the third diode D3 and the third capacitor C3 at the same time, so that the output voltage Vo is higher than the secondary output voltage Vi, and the boosting process of the secondary output voltage Vi is completed; if the induced electromotive force on the third inductor L3 does not exceed the voltage on the third capacitor C3 at this time, the third diode D3 is turned off, the third capacitor C3 alone supplies power to the electric load, and the output voltage obtained by the electric load is lower than the secondary output voltage Vi at this time, so that the voltage reduction process of the secondary output voltage Vi is completed. Therefore, by adjusting the duty ratio of the on-off time of the third switch Q3, the secondary output voltage Vi can be boosted or reduced.
In this embodiment, the third inductor L3 is configured to store energy through the output current of the secondary transformer when the third charging circuit is turned on, and charge the third capacitor when the third charging circuit is turned on, or discharge the energy to the electrical load when the third discharging circuit is turned on.
In this embodiment, the third diode D3 is used to isolate the third inductor from discharging the third capacitor when the third discharging loop is turned on.
In the embodiment of the present application, the third capacitor C3 is configured to, when the third discharge circuit is turned on, supply power to the electrical load simultaneously with the third inductor if the induced electromotive force on the third inductor is higher than the output voltage at both ends of the third capacitor, so that the output voltage at both ends of the third capacitor is higher than the secondary output voltage of the secondary transformer coil, and the output voltage is supplied to the electrical load as the target voltage.
In this embodiment, the third capacitor C3 is further configured to, when the third discharging circuit is turned on, supply power to the electrical load if the induced electromotive force on the third inductor is smaller than the output voltage at the two ends of the third capacitor, so that the output voltage at the two ends of the third capacitor is lower than the secondary output voltage of the secondary transformer coil, and the output voltage is provided to the electrical load as the target voltage.
It should be noted that, in the embodiment of the present application, the output voltage of the switching dc buck-boost circuit is opposite in polarity to the secondary output voltage.
It can be understood that, when the first dc converting circuit is a switching dc voltage-increasing/decreasing circuit, the output voltage of the switching dc voltage-decreasing circuit is lower than the secondary output voltage of the secondary transformer coil by turning on/off the third switch, and the reduction range of the output voltage of the switching dc voltage-increasing circuit is controlled by controlling the duty ratio of turning on/off the third switch to meet the power consumption requirement of the power consumption load for continuous change.
It should be noted that the first switch, the second switch, and the third switch may be triodes, or may be any device capable of controlling on and off of a Field Effect Transistor (MOSFET), which is not specifically limited in this embodiment of the present application.
In addition, because the voltage when the field effect transistor is conducted is smaller than the voltage when the diode is conducted, the first diode, the second diode and the third diode can be replaced by the field effect transistor, so that the power loss can be reduced, and the conversion efficiency of the direct current conversion circuit can be improved.
In fig. 6, 8, and 10, the third terminals of the first switch, the second switch, and the third switch may be connected to a pulse signal generating circuit, and the pulse signal generating circuit is configured to generate a preset first control signal or a preset second control signal, and adjust duty ratios of the preset first control signal and the preset second control signal. The duty ratio of the pulse signal is adjusted to control the change amplitude of the DC conversion circuit to the initial voltage, so that different amplitudes can be changed for different secondary output voltages, and different secondary output voltages are adjusted to the target voltage.
In this embodiment of the application, based on the power conversion circuit shown in fig. 9, the switching dc step-up/step-down circuit 400_42 may be a charge pump circuit 400_43, as shown in fig. 11, the charge pump circuit 400_43 is configured to increase or decrease the secondary output voltage by performing on-off control on the charge pump circuit based on a preset voltage requirement of an electrical load, so as to obtain a target voltage.
In this embodiment of the present application, the charge pump circuit may be a switching regulator boost pump, or a non-regulation capacitive charge pump, or a regulation capacitive charge pump, or may be a charge pump circuit in other forms, which is specifically selected according to actual situations, and the embodiment of the present application is not limited.
In the embodiment of the application, based on the power conversion circuit shown in fig. 4, after the first dc conversion circuit, a plurality of stages of dc conversion circuits may be added according to the needs of the power load, for example, if the secondary output voltage needs to be increased to the target voltage, the initial voltage may be increased to the intermediate voltage through the first stage of dc conversion circuit, so that the intermediate voltage can be used as the input voltage of the next stage of dc conversion circuit, and the intermediate voltage is finally converted to the target voltage through the next stage of dc conversion circuit.
Illustratively, the target voltage is 260V, if the secondary output voltage is 215V, 215V can be raised to 230V by the one-stage switching dc boost circuit, and the 230V output by the switching dc boost circuit is raised to 260V by the one-stage charge pump circuit, here, when the multi-stage dc conversion circuit is combined, the switching dc boost circuit, the switching dc buck circuit, and the switching dc buck circuit can be selected to be combined in any number and form according to the actual use requirement, and the embodiment of the present application is not limited.
In some embodiments of the present application, based on fig. 4, when the output end of the power supply is ac, the power supply in the power conversion circuit may include a rectifying circuit and a pulse width modulation circuit as shown in fig. 14, and the rectifying circuit and the pulse width modulation circuit are configured to convert ac into dc when the output end of the power supply is ac.
In some embodiments of the present application, based on the power conversion circuit shown in any one of fig. 4, fig. 5, fig. 7, or fig. 9, the power conversion circuit may further include a first filter capacitor, where the first filter capacitor is connected in parallel between two ends of the secondary transformer coil and the dc conversion circuit, and is used to raise the secondary output voltage so that the secondary output voltage is not lower than the lowest operating voltage of the first dc conversion circuit.
In the embodiment of the present application, since the secondary output voltage generated by the secondary transformer coil is generally low in frequency, and the input voltage at the lowest point approaches to 0V, a first filter capacitor needs to be added between the secondary transformer coil and the dc conversion circuit, so that the input voltage obtained by the first dc conversion circuit does not drop too low, and the first dc conversion circuit is ensured to be in a working state.
In the embodiment of the present application, the first filtering capacitor may be a variable capacitor or a trimming capacitor, except for a fixed capacitor, so that the size of the first input capacitor may be adjusted according to the difference of the load, so as to achieve the optimal filtering and boosting effects, and the structure of the specific capacitor is set as required.
In the embodiment of the present application, the capacitance value of the first filter capacitor is mainly adjusted according to the size of the final power load, which is not limited in the embodiment of the present application. In some embodiments, the 100uF input capacitor can effectively support the first DC converter circuit to operate when the peak 120W load power is output.
In the embodiment of the application, when the initial voltage is the alternating voltage provided by the alternating current power supply, the power conversion circuit further comprises a rectification filter circuit, and the rectification filter circuit is connected between the alternating current power supply and the primary voltage transformation coil; the rectifying and filtering circuit is used for converting alternating current into direct current when the output end of the power supply is alternating current.
In the embodiment of the application, a pulse width modulation circuit can be connected between the rectification filter circuit and the primary transformer coil; the pulse width modulation circuit is used for generating pulse square waves according to current signals output by the rectifying and filtering circuit and applying the pulse square waves to the primary transformer coil.
In some embodiments, based on fig. 4, a power transforming circuit including a first filter capacitor may be as shown in fig. 12, the power source 120 includes an electrode L and an electrode N for outputting an ac sine wave electrical signal, a rectifying and filtering circuit 121 and a pulse width modulation circuit 122 are connected between the power source 120 and the primary transforming coil 123, wherein the rectifying and filtering circuit 121 is configured to convert the ac electrical signal into a dc electrical signal, the pulse width modulation circuit 122 is configured to generate a pulse square wave according to the electrical signal output by the rectifying and filtering circuit, and apply the pulse square wave to the primary transforming coil 123 of the transformer T1, and the first filter capacitor C4 is connected in parallel between two ends of the secondary transforming coil 124 and the first dc transforming circuit 125 and is configured to raise the secondary output voltage so that the secondary output voltage is not lower than the lowest operating voltage of the first dc transforming circuit 125.
The rectifying and filtering circuit 121 may be a half-wave rectifying circuit, a full-wave rectifying circuit, a bridge rectifying circuit, a voltage-doubling rectifying circuit, or other rectifying circuits, and the filtering circuit may be a passive filtering circuit or an active filtering circuit, and the specific type may be set as required, and therefore, the embodiment of the present application is not specifically limited.
In some embodiments, as shown in fig. 12, a filter diode D4 may be further connected in series between the positive electrode of the first filter capacitor C4 and the positive electrode of the secondary transformer coil for filtering the power signal output by the secondary transformer coil.
In some embodiments, based on fig. 12, the waveform of the ac electrical signal provided by the power source 120 after passing through the rectifying and filtering circuit 121 can be as shown in fig. 13, and the ac sinusoidal waveform input by the power source 120 after passing through the rectifying and filtering circuit 121 becomes the steamed bun waveform shown in fig. 13.
In some embodiments, based on fig. 13, the waveform of the electrical signal passing through the first filter capacitor C4 may be as shown in fig. 14, and since the first filter capacitor effectively raises the input voltage of the first dc converter circuit, the lowest voltage input by the first dc converter circuit is greater than 0V, as shown in fig. 14, and is about 4V, so as to meet the requirement of the lowest operating voltage of most of the circuits, such as the switching dc boost circuit, the switching dc buck-boost circuit, and the like.
In the embodiment of the present application, based on any one of the diagrams of fig. 4, fig. 5, fig. 7, fig. 9, fig. 11, or fig. 12, the power conversion circuit may be as shown in fig. 15, where the initial voltage is provided by the power supply 150_1, the power conversion circuit 15 includes a second dc conversion circuit 150_2, an input end of the second dc conversion circuit 150_2 is connected to an output end of the power supply 150_1, and an output end of the second dc conversion circuit 150_2 is connected to the primary transformer coil 150_ 3.
In the embodiment of the application, the second dc conversion circuit is configured to adjust the initial voltage based on the preset working voltage of the primary transformer coil, so as to obtain the target working voltage of the primary transformer coil in the transformer.
In the embodiment of the present application, the second dc conversion circuit may also be a switching dc boost circuit, a switching dc buck circuit, or a switching dc buck-boost circuit, and the circuit structure and buck-boost principle of the second dc conversion circuit are similar to those of the first dc conversion circuit, which is not described herein again.
It can be understood that, in the embodiment of the present application, the second dc converter circuit may raise the input voltage of the primary side of the transformer, and may effectively reduce or eliminate a dead zone of the transformer operation, so that at each moment, the power converter circuit may obtain sufficient voltage, and may also obtain sufficient voltage at the secondary side, so that the supply electric load may normally operate.
In this embodiment, the power conversion circuit may include a second filter capacitor, and the second filter capacitor is connected in parallel with the second dc conversion circuit; the power supply circuit is used for raising the initial voltage to enable the initial voltage to be not lower than the lowest working voltage of the second direct current conversion circuit, so that the second direct current conversion circuit can be effectively supported to work.
In this embodiment, the capacitance value of the second filter capacitor is mainly adjusted according to the target operating voltage of the primary transformer coil, which is not limited in this embodiment.
In some embodiments, based on fig. 12, the power conversion circuit including the second filter capacitor may be as shown in fig. 16, where in fig. 16, C5 is the second filter capacitor, and C5 is connected in parallel with the second dc conversion circuit 126.
In some embodiments, based on fig. 14 and 16, the waveform of the electrical signal output from the first filter capacitor C5 after being transformed by the transformer and the second filter capacitor C4 is raised may be as shown in fig. 17.
It can be understood that, in the embodiment of the present application, the second filter capacitor can ensure that the input voltage of the second dc conversion circuit always meets the minimum operating voltage required by the second dc conversion circuit, thereby ensuring the normal operation of the whole power conversion circuit.
As will be appreciated by one skilled in the art, embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of a hardware embodiment, a software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, optical storage, and the like) having computer-usable program code embodied therein.
The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
The above description is only a preferred embodiment of the present application, and is not intended to limit the scope of the present application.

Claims (14)

1. A power conversion circuit, comprising: the transformer comprises a primary transformer coil, a secondary transformer coil and a first direct current conversion circuit;
the primary transformer coil is coupled with the secondary transformer coil, and the secondary transformer coil is connected with the first direct current conversion circuit; the first direct current conversion circuit is connected with an electric load;
the primary transformer coil is used for generating an electromagnetic field according to an initial voltage input to the primary transformer coil and coupling the electromagnetic field to the secondary transformer coil;
the secondary transformation coil is used for generating induction current through the electromagnetic field, generating secondary output voltage according to the induction current and transmitting the secondary output voltage to the first direct current conversion circuit;
the first direct current conversion circuit is used for adjusting the secondary output voltage based on the preset required voltage of the electric load to obtain the target voltage.
2. The power conversion circuit according to claim 1, wherein the first dc conversion circuit includes: a switching DC boost circuit;
the switch direct current booster circuit is used for improving the secondary output voltage by performing on-off control on the switch direct current booster circuit based on the preset voltage requirement of the electric load, so as to obtain the target voltage.
3. The power conversion circuit according to claim 1, wherein the first dc conversion circuit includes: a switching DC step-down circuit;
the switch direct-current voltage reduction circuit is used for reducing the secondary output voltage by performing on-off control on the switch direct-current voltage reduction circuit based on the preset voltage requirement of the electric load, so as to obtain the target voltage.
4. The power conversion circuit according to claim 1, wherein the first dc conversion circuit includes: switching a DC buck-boost circuit;
the switching direct current boost circuit is used for increasing or reducing the secondary output voltage by performing on-off control on the switching direct current boost circuit based on the preset voltage requirement of the electric load to obtain the target voltage.
5. The power conversion circuit according to claim 2, wherein the switching dc boost circuit comprises: the first inductor, the first switch, the first diode and the first capacitor;
the first terminal of the secondary transformer coil is connected with the first end of the first inductor, the second end of the first inductor is connected with the first end of the first switch, and the second end of the first switch is connected with the second terminal of the secondary transformer coil and is grounded at the same time, so that a first charging loop is formed; the second end of the first inductor is connected with the anode of the first diode, the cathode of the first diode is connected with the anode of the first capacitor, and the cathode of the first capacitor is connected with the second end of the first switch and is simultaneously grounded, so that a first discharge loop is formed;
the first switch is used for conducting the first charging loop according to a preset first control signal; or the first discharging loop is conducted according to a preset second control signal;
the first inductor is used for storing energy through the output current of the secondary transformer coil when the first charging loop is conducted; or when the first discharging loop is conducted, discharging the first capacitor;
the first diode is used for isolating the first capacitor from discharging to the ground when the first charging loop is conducted;
the first capacitor is used for storing electricity through the secondary transformer coil and the first inductor when the first discharge loop is conducted, so that the output voltage at two ends of the first capacitor is higher than the secondary output voltage of the secondary transformer coil, and the output voltage at two ends of the first capacitor is used as the target voltage to be supplied to the electric load.
6. The power conversion circuit according to claim 3, wherein the first dc conversion circuit includes: a switched DC buck circuit, the switched DC buck circuit comprising: the second switch, the second diode, the second inductor and the second capacitor; the first terminal of the secondary transformer coil is connected with the first end of the second switch, the second end of the second switch is connected with the first end of the second inductor, the second end of the second inductor is connected with the anode of the second capacitor, and the cathode of the second capacitor is connected with the second terminal of the secondary transformer coil and is grounded at the same time, so that a second charging loop is formed; the first end of the second inductor is connected with the cathode of the second diode, and the anode of the second diode, the second terminal of the secondary transformation coil and the cathode of the second capacitor are simultaneously connected and grounded, so that a second discharge loop is formed;
the second switch is used for conducting the second charging loop according to a preset first control signal; or the second discharging loop is conducted according to a preset second control signal;
the second inductor is used for storing energy through the output current of the secondary transformer coil when the second charging loop is conducted; or when the second discharge loop is conducted, discharging the second capacitor;
the second diode is used for isolating the secondary transformation coil from discharging to the ground when the second charging loop is conducted;
the electric load is connected in parallel with the second capacitor, and the second capacitor is used for discharging with the second inductor when the second discharging loop is conducted, so that the output voltage at two ends of the second capacitor is lower than the secondary output voltage of the secondary transformer coil, and the output voltage at two ends of the second capacitor is used as the target voltage to be supplied to the electric load.
7. The power conversion circuit according to claim 4, wherein the first dc conversion circuit includes: switching a DC buck-boost circuit; the switching direct-current buck-boost circuit comprises a third switch, a third inductor, a third diode and a third capacitor, wherein a first terminal of the secondary transformation coil is connected with a first terminal of the third switch, a second terminal of the third switch is connected with a first terminal of the third inductor, a second terminal of the third inductor is connected with a second terminal of the secondary transformation coil, so that a third charging loop is formed, a first terminal of the third inductor is connected with a cathode of the third diode, a second terminal of the third inductor is connected with an anode of the third capacitor, and a cathode of the third capacitor is connected with an anode of the third diode, so that a third discharging loop is formed; the third inductor, the third capacitor and the electric load are connected in parallel;
the third switch is used for conducting the third charging loop according to a preset first control signal; or the third discharging loop is conducted according to a preset second control signal;
the third inductor is used for storing energy through the output current of the secondary transformer coil when the third charging loop is conducted; or when the third discharging loop is conducted, the third capacitor and the third discharging loop discharge to the electric load simultaneously;
the third diode is used for isolating the third inductor from discharging the third capacitor when the third discharging loop is conducted;
the third capacitor is configured to, when the third discharge loop is turned on, supply power to the power consumption load simultaneously with the third inductor if an induced electromotive force on the third inductor is higher than an output voltage at both ends of the third capacitor, so that the output voltage at both ends of the third capacitor is higher than a secondary output voltage of the secondary transformer coil and is supplied to the power consumption load as the target voltage;
the third capacitor is further configured to, when the third discharge loop is turned on, supply power to the power consumption load if the induced electromotive force on the third inductor is smaller than the output voltage at the two ends of the third capacitor, so that the output voltage at the two ends of the third capacitor is lower than the secondary output voltage of the secondary transformer coil, and the output voltage is provided to the power consumption load as the target voltage.
8. The power conversion circuit according to any one of claims 1 to 7, further comprising: a first filter capacitor, wherein,
the first filter capacitor is connected between two ends of the secondary transformation coil and the first direct current conversion circuit in parallel;
the first filter capacitor is used for raising the secondary output voltage, so that the secondary output voltage is not lower than the lowest working voltage of the first direct current conversion circuit.
9. The power conversion circuit of claim 8, wherein the initial voltage is provided by a power supply, the power conversion circuit further comprising: a second DC conversion circuit;
the input end of the second direct current conversion circuit is connected with the output end of the power supply, and the output end of the second direct current conversion circuit is connected with the primary transformation coil;
the second direct current conversion circuit is used for adjusting the initial voltage based on the preset working voltage of the primary transformation coil to obtain the target working voltage of the primary transformation coil.
10. The power conversion circuit according to claim 9, further comprising: the second filter capacitor is connected with the second direct current conversion circuit in parallel; the controller is used for raising the initial voltage to enable the initial voltage not to be lower than the lowest working voltage of the second direct current conversion circuit.
11. The power conversion circuit according to claim 1, wherein when the initial voltage is an ac voltage supplied from an ac power source, the power conversion circuit further includes a rectifying and filtering circuit connected between the ac power source and the primary transformer coil; the rectification filter circuit is used for converting the alternating current into direct current.
12. The power conversion circuit according to claim 11, wherein a pulse width modulation circuit is connected between the rectifying filter circuit and the primary transformer coil; the pulse width modulation circuit is used for generating pulse square waves according to the current signals output by the rectifying and filtering circuit and adding the pulse square waves to the primary variable voltage coil.
13. The power conversion circuit of claim 2, wherein the switching dc boost circuit comprises at least one of: the circuit comprises a BOOST circuit, a BUCK/BOOST circuit, a charge pump circuit and a CUK circuit.
14. The power conversion circuit of claim 3, wherein the switching DC down circuit comprises at least one of: the circuit comprises a BUCK circuit, a BUCK/BOOST circuit, a charge pump circuit and a CUK circuit.
CN202010172719.9A 2020-03-12 2020-03-12 Power supply conversion circuit Pending CN113394980A (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
CN202010172719.9A CN113394980A (en) 2020-03-12 2020-03-12 Power supply conversion circuit
PCT/CN2021/078474 WO2021179930A1 (en) 2020-03-12 2021-03-01 Power supply conversion circuit and power supply conversion method
EP21768049.5A EP4120534A4 (en) 2020-03-12 2021-03-01 Power supply conversion circuit and power supply conversion method
US17/942,884 US20230006562A1 (en) 2020-03-12 2022-09-12 Power supply conversion circuit and power supply conversion method

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Application publication date: 20210914